Customize the `mongosh` Prompt

On this page

Display Line Numbers

Display Database and Hostname
Display System Up Time and Document Count

The prompt variable can store strings and JavaScript code to customize the mongosh prompt. Use a function that returns a string to display dynamic information in the prompt.

Custom prompts are not stored when you exit mongosh. To have a custom prompt persist through restarts, add the code for your custom prompt to .mongoshrc.js.

Display Line Numbers

This code will dynamically update the mongosh prompt to display line numbers:

let cmdCount = 1;
prompt = function() {
             return (cmdCount++) + "> ";
         }

The prompt will look like this:

1> show collections
2> use test
3>

Display Database and Hostname

To display the database and hostname in the mongosh prompt, use a function like this one:

{
   const hostnameSymbol = Symbol('hostname');
   prompt = () => {
      if (!db[hostnameSymbol])
         db[hostnameSymbol] = db.serverStatus().host;
      return `${db.getName()}@${db[hostnameSymbol]}> `;
   };
}

The prompt will look like this:

admin@centos0722:27502>

Display System Up Time and Document Count

To create a prompt that shows the system uptime and a count of documents across all collections in the current database, use a function like this one:

prompt = function() {
   return "Uptime:" + db.serverStatus().uptime +
          " Documents:" + db.stats().objects +
          " > ";
   }

← Configure mongosh Using a Configuration FileEditor Mode →